JP2000143056A - Sheet processing device and image forming device provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfactorily load a curled sheet discharged by a discharge means onto a loading means of a sheet processing device. SOLUTION: Curl condition of sheets to be discharged on a processing tray 130 by a pair of first discharge rollers 7 is detected by sensors 138, 139, curl condition of sheets to be discharged on a stack tray 200 by a pair of bundle discharge rollers 180 is detected by sensors 176, 177, and a discharge speed of a pair of first discharge rollers 7 (a pair of bundle discharge rollers 180) is controlled by a controller based on the detection information. Consequently, it is possible to load curled sheet on the processing tray (the stack tray) satisfactorily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet processing apparatus, and more particularly, to stacking of an image-formed sheet discharged from an image forming apparatus such as a copying machine or a printer, and processing such as stapling the sheet. The present invention relates to a sheet processing apparatus that performs the following.

[0002]

2. Description of the Related Art Conventionally, an image-formed sheet discharged from an image forming apparatus such as a copying machine or a printer is stacked on a tray of a sheet stacking apparatus, and the sheet is processed by a first discharging means of the sheet processing apparatus. Tray (first loading means)
A sheet processing apparatus has been proposed in which the sheet is discharged onto a stack tray (second stacking means) by a second discharge means after performing processing such as alignment, stapling, and the like.
Further, in order to keep the height of the stack tray from the processing tray in a state where a large number of sheets are stacked, a sheet processing apparatus including a paper surface position detection sensor has been proposed.

[0003]

However, in the above-mentioned conventional example, the curl of the discharged sheet causes the tray of the sheet stacking apparatus and the image forming apparatus, the processing tray (first stacking means), and the stack tray ( The state of each loaded sheet on the second loading means) is different.

[0004] For example, if the loaded sheets on the tray are curled downward, the frictional resistance between the paper sheets becomes larger than the force of the discharged sheets sliding on the loaded sheets, and there is a possibility that return failure may occur. Was. In the case of upper curl, the ejected sheet is ejected along the already loaded sheet,
The frictional resistance due to the sliding of the sheet was large, and there was a possibility that defective discharge occurred.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to provide a sheet processing apparatus having a good stacking property irrespective of curling of already stacked sheets on a tray. is there.

[0006]

The invention according to claim 1 is
Discharging means for discharging the conveyed sheet, stacking means for stacking the sheets discharged by the discharging means, curl detecting means for detecting the curl state of the sheets stacked on the stacking means, and curl detecting means Control means for controlling the discharge speed of the discharge means based on the curl information of the sheet.

The invention according to claim 2 is characterized in that the curl detecting means can detect the curl direction and the curl amount of the sheet on the stacking means.

According to a third aspect of the present invention, the control means includes:
The discharge speed of the sheet discharge means can be controlled by a plurality of different speed tables.

According to a fourth aspect of the present invention, there is provided a sheet discharging means for discharging a sheet, a processing tray for stacking the sheets discharged by the sheet discharging means, and a bundle for discharging the bundle of sheets stacked on the processing tray. A stack tray for stacking the sheet bundle discharged by the bundle discharging unit, wherein the discharging unit is the sheet discharging unit, and the stacking unit is the processing tray.

According to a fifth aspect of the present invention, there is provided a sheet discharging means for discharging a sheet, a processing tray for stacking the sheets discharged by the sheet discharging means, and a bundle for discharging the bundle of sheets stacked on the processing tray. A stack tray for stacking the sheet bundle discharged by the bundle discharge unit, wherein the discharge unit is the bundle discharge unit, and the stacking unit is the stack tray.

According to a sixth aspect of the present invention, there is provided a sheet discharging means for discharging a sheet, a processing tray for stacking the sheets discharged by the sheet discharging means, and a bundle for discharging the bundle of sheets stacked on the processing tray. Discharging means, and a stack tray for stacking the sheet bundle discharged by the bundle discharging means, wherein the discharging means is the sheet discharging means and the bundle discharging means, and the stacking means is the processing tray and It is the stack tray.

[Operation] Based on the above configuration, the curl state of the sheet discharged by the discharging means and loaded on the stacking means is detected by the curl detecting means. Based on the detection of the curl state, the discharge speed of the discharge unit is controlled by the control unit, and the sheets are properly stacked on the stacking unit.

Further, by detecting the curl amount and the curl direction of the sheet by the curl detecting means, the discharge speed of the discharge means can be appropriately controlled, and the sheets can be satisfactorily stacked on the stacking means.

Further, by controlling the discharge speed of the discharge means using a plurality of speed tables, it is possible to control the discharge speed at a plurality of different speeds in accordance with the curl amount of the sheet, and it is possible to load the sheets on the stacking means well.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A preferred embodiment of a sheet processing apparatus according to the present invention and an image forming apparatus having the same will be described in detail with reference to the drawings.

First, an image forming apparatus according to the present invention,
Here, an image forming apparatus including the sheet processing apparatus will be described with reference to FIG.

The ADF 2, which is a document conveying device (sheet material conveying device), has a document tray 4 above, and a wide belt wound around a driving roller 36 and the other turn roller 37 is disposed below the document tray 4. ing. The document (sheet material) P on the document tray 4 is sequentially separated and fed from the uppermost sheet by a separating unit, and is conveyed to a platen glass (platen) 3 which is a reading position (image reading unit) of the copying machine main body. .

The wide belt abuts on the platen 3 so as to be freely rotatable in the forward and reverse directions. The wide belt places the sheet material document P conveyed from the document tray 4 at a predetermined position on the platen 3, The upper sheet material document P is carried out onto the discharge tray 10. The document P is one page (2
Pages), 3 pages (4 pages),...

Copying machine body 1 'as image forming apparatus body
Comprises an image input unit 200 '(hereinafter referred to as a reader unit) and an image output unit 300 (hereinafter referred to as a printer unit).

The reader section 200 'optically reads image information recorded on the original P, photoelectrically converts the read image information, and inputs the image data as image data.
2. Scanner unit 204 having mirror 203
And mirrors 205 and 206, a lens 207, an image sensor 208, and the like. The printer unit 300 is an image forming unit using well-known electrostatic latent image formation.

Next, a printer unit 30 serving as an image output unit
0 will be explained.

Reference numeral 800 denotes an upper cassette. Sheet materials in the cassette are separated and fed one by one by the action of a separation claw and a feeding roller 801, and are guided to registration rollers 806.
Reference numeral 802 denotes a lower cassette. Sheet materials in the cassette are separated and fed one by one by the action of a separation claw and a feeding roller 803, and are guided to registration rollers 806. Reference numeral 804 denotes a manual feed guide for guiding sheet materials one by one to a registration roller 806 via a roller 805. Reference numeral 808 denotes a sheet material stacking device (deck type), which includes a middle plate 808a that moves up and down by a motor or the like. It is guided to the roller 810.

Reference numeral 812 denotes a photosensitive drum, reference numeral 813 denotes a reading optical system, reference numeral 814 denotes a developing device, reference numeral 815 denotes a transfer charger, and reference numeral 816 denotes a separation charger.

Reference numeral 817 denotes a conveyance belt for conveying the sheet material on which an image is formed, 818 denotes a fixing device, 819 denotes a conveyance roller, and 820 denotes a flapper. The sheet material on which the image has been formed is guided to the main body discharge roller (main body discharge unit) 821 by the flapper 820, and is discharged to the downstream sheet processing apparatus.

An image is formed on the photosensitive drum in accordance with the set number of copies for one document placed on the platen, and sheet materials for the number of copies are stored in the cassette 80.
0, 802, or the deck 808, the image is fed each time an image is formed on the photosensitive drum. The registration between the image on the photosensitive drum and the sheet material is performed by a registration roller 806.

When the required number of copies are formed, the original is discharged from the platen, and the next original is positioned on the platen. Hereinafter, the same applies.

Reference numeral 900 denotes an intermediate tray which, when forming an image on both sides of the sheet material or forming an image on one side of the sheet material (multiple), once, forms the image-formed sheet material once. Stock it. 901 is a conveying roller, 9
02 is a transport belt, 903 is a flapper, 904 is a transport belt, and 905 is a transport roller. In the case of double-sided copying, the sheet material is guided to the intermediate tray 900 through the path 906.

The sheet material has the image surface facing upward. In the case of multiple copying, the sheet material is guided to the intermediate tray 900 through the path 907. The sheet material has the image side facing down.

The sheet material stacked on the intermediate tray 900 includes auxiliary rollers 909 and 910, a forward / reverse separation roller pair 9.
The sheets are separated one by one from below by the action of 11 and re-fed. The re-fed sheet material is transported by rollers 913 and 9
14, 815, roller 810, registration roller 806
Through to the image forming unit. After image formation, the paper is discharged in the same manner as described above.

A single-sided copy is first made according to the number of copies set for one document placed on the platen, and these are stacked on the intermediate tray 900. After that, the original is reversed on the platen and guided again on the platen, and this image is read by the number of copies. The read image is formed on a sheet material re-fed from the intermediate tray 900 every time the image is read. On the other hand, there is also a method in which only one copy is created each time a document is rotated by the automatic document feeder. According to this method, even when a plurality of copies are made, a copy group with the same page order can be obtained in order, so that a necessary number of copies can be obtained separately without a sorter. When performing double-sided copying with this method, 1
Read both sides of one sheet of paper continuously, copy and print on both sides of the sheet material, discharge it, and then repeat the same process for both sides of the next document. A group is obtained.

An image-formed sheet discharged from the copying machine main body is discharged to a sheet processing apparatus (also referred to as a finisher) 1 by a main body discharging roller (main body discharging means) 302.

The sheet carried in from the copying machine body 1 'is
In the case of the non-sort mode, the sheet is discharged to the sample tray 201 by the discharge roller 9 via the buffer roller 5, the flapper 11, and the non-sort mode path 21. Also,
In the sort mode, the buffer roller 5, the flapper 1
0, the sheet is temporarily loaded on the processing tray 130 as an intermediate tray by the discharge roller 7 via the sort mode path 22. The sheet bundle on the processing tray 130 is aligned on both sides in the direction intersecting the sheet conveyance direction by an alignment member (not shown), and the stapler 100 (101) binds the rear end of the sheet as necessary. After that, the sheet is discharged onto the stack tray 200 by the bundle discharge roller pair 180.

Next, a sheet processing apparatus according to the present invention will be described.

<Overview of Overall Sheet Processing Apparatus> First, the main components of the sheet processing apparatus will be described.

FIG. 1 is an overall sectional view schematically showing a schematic configuration of a sheet processing apparatus according to the present embodiment.

In the configuration of the sheet processing apparatus (hereinafter referred to as “finisher”) 1 shown in FIG. 1, reference numeral 2 denotes an inlet roller pair for receiving the sheet P discharged from the discharge roller pair 302 of the image forming apparatus main body 300; 3 is
A first conveying roller pair for conveying the received sheet P, 31
Is a sheet detection sensor on the entrance side for detecting the passage of the sheet P. 50 is a sheet P to be conveyed.
This is a punch unit that drills holes near the rear end. 5
Is a relatively large-diameter conveying large roller 5 (hereinafter referred to as a "buffer roller") disposed in the middle of conveying, and presses the sheet P against the roll surface by pressing rollers 12, 13, and 14 arranged around the outside. Transport.

Reference numeral 11 denotes a first switching flapper,
The non-sort path 21 and the sort path 22 are selectively switched. Reference numeral 10 denotes a second switching flapper, which switches between a sort path 22 and a buffer path 23 for temporarily storing sheets P. A sensor 33 detects the sheet P in the non-sort path 21, and a sensor 32 detects the sheet P in the buffer path 23.

Reference numeral 6 denotes a second conveying roller pair of the sort path 22, and 129 temporarily accumulates the sheets P, aligns the accumulated sheets P, and sets the staple unit 10 together.
A processing tray unit 129 including an intermediate tray (hereinafter, referred to as “processing tray”) 130 provided for performing stapling processing by the stapler 101 of No. 0;
On the discharge end side of the processing tray (first loading means) 130,
One of the discharge rollers constituting the bundle discharge roller pair (second stacking means), here, a lower bundle discharge roller (second discharge means) 180a as a fixed side is disposed. Reference numeral 7 denotes a first discharge roller pair 7 (first discharge means) which is disposed on the sort path 22 and discharges the sheet P onto the processing tray 130, and is driven by the drive motor M7. And a second discharge roller pair for discharging the sheet P onto the sample tray 201.

180b is supported by the swing guide 150, and when the swing guide 150 comes to the closed position,
An upper discharge roller (second discharge unit) for discharging the sheet P on the processing tray 130 onto the stack tray (second stacking unit) 200 while being pressed against the lower bundle discharge roller 180a. It is. 40 is a stack tray 200
And a bundle stacking guide that supports a rear end (rear end with respect to the bundle discharge direction) edge of the sheet bundle stacked on the sample tray 201, and also serves as an exterior of the sheet processing apparatus 1 here.

<Detailed Description of Staple Unit>
In particular, FIG. 2 (a side view corresponding to the main cross section) and FIG. 3 (a plan view in the direction of the arrow a in FIG. 2) regarding the staple unit 100.
This will be described in detail with reference to FIG. 4 and a rear view in the direction of the arrow b in FIG.

The stapler (binding means) 101 is fixed on a moving table 103 via a holder 102. The moving table 103 has a set of stud shafts 10 fixed parallel to the trailing edge of the sheets stacked on the processing tray 130.
4 and 105, and each stud shaft 104 and 105 has
Rolling rollers 106 and 107 are rotatably mounted on each of the rolling rollers 106 and 107. Each of the rolling rollers 106 and 107 is a series of hole-shaped guide rails formed in the same manner as the fixing table 108 in a parallel state. It is movably engaged within 108a, 108b, 108c.

Each of the rolling rollers 106, 107 has a flange 106a, 107a having a diameter larger than the width of a series of hole-shaped guide rails 108a, 108b, 108c, while a moving table 103 for holding the stapler 101. The support table 109 is provided at three places on the lower surface side of the moving table 103. The moving table 103 is provided with a series of hole-shaped guide rails 108a, 108a.
It is movable on the fixed base 108 along b and 108c.

Here, the series of hole-shaped guide rails 10
As can be seen from FIG. 3, 8a, 108b and 108c are formed from the main guide rail hole portion (108a), the left end guide rail hole portion (108b) which is branched from the left end side and parallel to the left end side. It is formed in a shape comprising a right end guide rail hole portion (108c) which is branched and parallel. Therefore, when the stapler 101 is located on the left end side due to the rail shape of each part, the rolling roller 106 is located in the left end of the rail hole portion 108b, and the rolling roller 107 is located in the left end of the rail hole portion 108a. Respectively, is maintained in a right-tilted posture in a state of being inclined to the right side by a predetermined angle, and when located in the middle portion,
Each rolling roller 106, 107 is a rail hole portion 108a.
And is maintained in a non-tilted parallel posture,
When located at the right end, the rolling roller 107 is moved into the right end of the rail hole portion 108c, and the rolling roller 106 is moved into the right end of the rail hole portion 108a, and is inclined by a predetermined angle to the left. In this state, the posture is maintained to the left and the posture is changed by an operation cam (not shown).

The stapling unit 100 is provided with a position sensor (not shown) for detecting the home position of the stapler 101. In a normal case, the stapler 101 is at the home position on the left side, which is the front portion. I'm waiting.

<Detailed description of stapler moving mechanism>
The moving mechanism of the stapler 101 will be described in detail.

One rolling roller 106 of the moving table 103
The pinion gear 106b below the flange 106a
Are formed integrally, and a belt pulley 106c is integrally provided above. The pinion gear 106b is
It is connected via a drive belt stretched between the output pulley of the drive motor M100 on the base surface and the belt pulley 106c, and is fixed along the rail hole.
The movable table 103 is movable in the sheet width direction together with the stapler 101 in accordance with the forward / reverse rotation of the drive motor M100.

The stud shaft 111 extending downward from the lower surface of the movable table 103 is provided with a stopper falling roller 112. The stopper falling roller 112 will be described later in detail. In order to avoid abutment between the rear end stopper 131 and the stapler 101, the rear end stopper 131 plays a role of rotating the rear end stopper 131.

<Detailed Description of the Rear End Stopper> Next, the rear end stopper 131 that abuts and supports the rear edge of the sheet P on the processing tray 130 will be described in detail.

The rear end stopper 131 is provided on the processing tray 130.
The sheet P is formed by being raised vertically to the loading surface of the sheet P.
Abutting support surface 131a for abutting and supporting the rear edge of the processing tray 13a.
On the lower surface side of "0", it is swingable downward around the pivot pin 131b as shown by an arrow. Further, a main link 132 having a cam surface 132a against which the stopper falling roller 112 is pressed to be pressed is abutted against an abutment plate 136, and a shaft 1 fixed to a frame (not shown) or the like.
34 is pivotable about the tension spring 135 against the tension spring 135, and the other end of the connection link 133 whose one end is pivotally supported on the rear end stopper 131 by the pin 131c with respect to the upper end pin 132b. It is slidably connected to the elongated hole.

Therefore, in this case, with the movement of the moving table 103, the stopper falling roller 112 of the moving table 103 presses the cam surface 132 a of the main link 132 with respect to the rear end stopper 131 which is in an interference relationship with the stapler 101. By doing so, it is pivoted to the non-interference position indicated by the two-dot chain line in the figure, thereby avoiding collision with the stapler 101. Then, after the stapling process described later is completed, the movable table 103 returns to the home position,
The rear end stopper 131 also returns to the original state. Here, for the stopper falling roller 112, the stapler 1
In order to keep the trailing end stopper 131 at the avoidance position during the operation of the moving table 01, a plurality (three in this case) are provided in the moving direction of the moving table 103.

On both sides of the holder 102 holding the stapler 101, a staple stopper (shown by a two-dot chain line in FIG. 2) 113 having a support surface having the same shape as the butting support surface 131a of the rear end stopper 131 is provided. Is provided so that the trailing edge of the sheet can be supported even when the trailing end stopper 131 is at the avoidance position.

<Overview of Processing Tray Unit>
Processing tray unit 129 including the processing tray 130
This will be described in detail with reference to FIG.

The processing tray unit 129 includes a processing tray 130, a rear end stopper 131, an alignment means 140,
The swing guide 150, the pull-in paddle 160, the retreat tray 170, and a bundle discharge roller pair 180 are provided.

In this case, with respect to the processing tray 130, the downstream side (upper left side in FIG. 5) is positioned upward and the upstream side (lower right side in FIG. 5) is positioned lower than the sheet bundle discharging direction. The rear end stopper 131 is disposed at the lower end on the upstream side.
A retractable paddle 160, which will be described later occupying the left and right positions, and an aligning means 140 are arranged in the intermediate portion. An upper end portion, which is a downstream side, specifically, an upper region portion substantially in a unit configuration is described later. A swing guide 150 including a retractable paddle 160 and a bundle discharge roller pair 180 is disposed,
Further, the upper end portion on the downstream side, more specifically, substantially the lower region portion of the unit configuration, and the stack tray 20
Between 0, a haunting tray 170 described later is arranged.

The sheet P discharged from the first discharge roller pair 7 has its rear end edge abutting against the rear end stopper 131 due to its own weight and the action of a retraction paddle 160 described later. It slides on the processing tray 130 until it is hit against 131a.

Further, at the upper end of the processing tray 130, as described above, one lower bundle discharge roller 180a constituting the bundle discharge roller pair 180 is disposed, and the lower surface of the swing guide 150 is disposed. At the front end portion, the other upper bundle discharge roller 180b that is in contact with the lower bundle discharge roller 180a so as to be able to freely contact and detach is arranged. These discharge roller pairs 180a and 180b are driven in reverse by a drive motor M180. It is rotatable.

Above the processing tray 130, sensors (curl detecting means) 138 and 139 (FIG. 22) for detecting the height of the already loaded paper on the processing tray 130 are provided.

<Detailed Description of Alignment Means> Next, the alignment means 140 will be described with reference to FIGS. 5 and 5C (rear view).
This will be described in detail with reference to FIG.

A pair of alignment members 141 and 142 constituting the alignment means 140 are arranged on the surface of the processing tray 130 as shown in FIG.
In the lower part (back side part) and the upper part (front side part),
The first alignment member (front alignment member) 141 at one front side and the second alignment at the other front side are arranged independently facing each other corresponding to both side edges of the sheet P. The members (rear alignment members) 142 are alignment surfaces 141a and 142a perpendicular to the surface of the processing tray 130 for pressing and supporting the sheet side end surfaces, respectively, and a rack gear portion 141b for supporting the sheet back surface. , 142b, and each of the rack gear portions 141b, 142b is provided with a lower surface through a pair of guide grooves 130a, 130b opened in the vertical direction (corresponding to the width direction of the sheet P) formed in the surface of the processing tray 130. Located on the side.

That is, in summary, the respective alignment surfaces 141a and 141
The rack gears 141b and 142b are mounted on the lower surface of the rack gear 2a so as to be movable in the alignment direction.

The rack gears 141b, 142
b, each drive motor M141, M1
The respective pinion gears 143 and 144 driven to rotate forward and reverse by the gear 42 are meshed with each other, whereby the first and second alignment members 141 and 142 can be moved in the alignment direction. Here, a position sensor (not shown) for detecting the home position of each of the first and second alignment members 141 and 142 is disposed. , The second alignment member 142 is on standby at the respective home position positions set at the lower end (rear side).

<Detailed Description of Swing Guide> Next, the swing guide 150 will be described in detail.

As described above, the swing guide 150 is located at the front end of the lower surface corresponding to the downstream side (left side in FIG. 5), and the upper bundle abuts against the lower bundle discharge roller 180a of the bundle discharge roller pair 180. While the discharge roller 180b is pivotally mounted,
Support shaft 1 at the rear end of the lower surface corresponding to the upstream side (right side in FIG. 6)
51, it is pivotally supported by a drive motor M150, and is rotatable by the control driving of the rotary cam 152 by a drive motor M150.
The home position is a closed state in which the upper bundle discharge roller 180b is brought into contact with the upper bundle discharge roller 180b, and this is detected by a position sensor (not shown).

In the normal case, when each of the sheets P is discharged onto the processing tray 130, the sheet P is opened (the lower bundle discharge roller 180a is positioned relative to the upper bundle discharge roller 180b).
Is moved to the upper side of the swing guide 150) so that the operations of discharging and aligning the sheet P and the pulling-in paddle operation described below can be performed without any trouble. When discharging the sheet bundle after the processing on 130 onto the stack tray 200,
The state shifts to a closed state (the upper bundle discharge roller 180b abuts against the lower bundle discharge roller 180a, and the swing guide 150 swings downward).

<Detailed Description of Retraction Paddle> Next, the retraction paddle 160 will be described in detail.

The pull-in paddle 160 is fixed to a plurality of positions on the drive shaft 161 above the processing tray 130 (FIG. 5), and is driven to rotate counterclockwise in FIG. 5 at an appropriate timing by a drive motor M160. The length of each pull-in paddle 160 is set to be slightly longer than the interval to the surface of the processing tray 130, and the home position is set on the processing tray 130 from the first discharge roller pair 7. 5 is set at a position that does not hinder the discharge of the sheet P (the position indicated by the solid line in FIG. 5).

When the sheet P is discharged onto the processing tray 130 in this state, the pull-in paddle 160
Is rotated counterclockwise, so that the processing tray 1
The sheet P discharged onto the sheet 30 and the trailing edge of the sheet P are retracted until the sheet P is abutted against the abutting support surface 131a of the trailing end stopper 131. Thereafter, the retracting paddle waits for a predetermined time. It stops at the home position detected by a position sensor (not shown) with good timing.

<Detailed Description of the Retreat Tray> Next, the retreat tray 170 will be described in detail with reference to FIG. 5 and FIG. 7, which is a view taken in the direction of the arrow d in FIG.

The retreat tray 170 is provided with a bundle discharge roller pair 18.
0, it is located below the lower bundle discharge roller 180a, and moves forward and backward in the sheet bundle discharge direction (X direction in FIGS. It is supposed to.

That is, at the protruding position of the retreat tray 170, the tip protrudes to the upper side of the stack tray 200 (indicated by the two-dot chain line in FIG. 5), and at the retreat position (home position), the lower bundle discharges. It retracts while being drawn inward from the roller 180a (the position indicated by the solid line in FIG. 5). In the protruding state of the retreat tray 170, the center of gravity of the sheet P discharged onto the processing tray 130 does not exceed the position, in other words, the leading end of the sheet P does not hang downward at the protruding position. In addition, the position of the haunting tray 170 is set.

[0086] The retractable tray 170 is provided with a pair of guide rails 172 and 172 fixed to a support frame 171.
Since the rotating cam roller 173 slidably supported on the rotating shaft 174 and rotating about the rotating shaft 174 is engaged in the lower surface groove 175 of the retractable tray 170,
The retracting operation is performed as described above in accordance with the rotation operation of the rotary cam roller 173 by the drive motor M170, and normally stands by at the home position position detected by a position sensor (not shown).

Further, sensors (curl detecting means) 176 and 177 for detecting the height of the stacked paper on the stack tray 200 in the above-mentioned protruding state are provided on the lower surface of the retreat tray 170.
(FIG. 22) is provided.

<Detailed Description of Stack Stack Tray and Sample Tray> Next, the stack tray 200 and the sample tray 201 will be described in detail with reference to FIGS. 8 and 9.

The stack tray 200 and the sample tray 201 can be selectively used depending on the situation. The stack tray 200 disposed below is selected when receiving a sheet bundle for copy output, printer output, and the like. The sample tray 201 arranged above is selected when receiving sheets for sample output, interrupt output, output when the stack tray overflows, function output, output when jobs are mixed, and the like.

The stack tray 200 and the sample tray 201 are held by tray base plates 202 and 203, respectively, and are mounted on the base plates 202 and 203, respectively.
5, stepping motors M200, M2 fixed via
In this case, since each of them is independently movable in the up-and-down elevating direction. In this case, since both are configured in substantially the same manner, here, mainly the stack tray 200 side Is described only.

At both ends of the sheet processing apparatus 1, a pair of frames 250, 250 are provided in the vertical direction, and rack gears which also function as vertical guide rails for the frames 250, 250 respectively. Member 25
1,251 are attached. A rear end extending from one of the tray base plates 202 (corresponding to the left end side with respect to the sheet width direction) and a rear end extending from the mounting frame plate 204 opposed thereto (also corresponding to the right end side). And a pair of guide rollers 206 and 207 provided rotatably on the respective parts.
The stacking tray 200 is held so as to be able to move up and down by fitting the 207 into each corresponding guide rail portion, and the regulating member 208 is engaged with the folded edge of one frame 250, The rattling in the sheet width direction is restricted and restricted.

On the other hand, the rotation output of the stepping motor M 200 is transmitted to the drive shaft 213 via the timing belt 211.
To the pulley 212. The drive shaft 213 is provided with a ratchet wheel 215 urged by a spring 216 and capable of sliding only in the axial direction. The ratchet wheel 215 is driven in one direction by a drive gear 214 on the shaft. It is engaged as much as possible. The driving gear 214
, One of idler gears 218, 218 disposed at both ends on the driven shaft 217 is meshed with each other, and each of the idler gears 218, 218 is respectively connected to a lifting gear 219,
219 via the rack gear members 251 and 251. That is, the stack tray 200
It is vertically movable up and down via a drive system composed of these gear trains.

The driving gear 21 on the driving shaft 213
Ratchet wheel 215 which is unidirectionally biasedly engaged with the wheel 4
Is provided when the stack tray 200 is lowered so that, for example, the drive system is not broken by foreign matter or the like. Here, a required urging force is applied to the spring 216. The stack tray 2
Only at the time of the rise of 00, protection is performed by idling against the urging force of the spring 216 in response to a preset condition, and if this idling condition, that is, an abnormality occurs, stepping is immediately performed. Motor M2
In order to stop the driving of the driving gear 00, a clock slit or the like formed in the flange portion of the driving gear 214 is detected by the sensor S201. The sensor S2
01 is also used for step-out detection during normal operation.

Next, the arrangement of each sensor for controlling the vertical position of the stack tray 200 and the sample tray 201 will be described.

The sensor S202 is connected to the sample tray 201
And detects that the sample tray 201 is located in a range that belongs to an area from the upper limit position detection sensor S203a to the processing tray sheet surface detection sensor S205.

The sensor S203b is a sensor for detecting that the number of sheets P discharged from the second discharge roller pair 9 onto the sample tray 201 has reached a predetermined number. From S204, it is arranged at a position equivalent to 1000 sheets.

The sensor S203c is a sensor for detecting that the number of sheets P discharged from the processing tray 130 onto the sample tray 201 has reached a predetermined number.
It is arranged at a position corresponding to 000 sheets.

The sensor S203d is connected to the stack tray 20
Numeral 0 denotes a sensor for limiting the height of the stacking amount when the sheets P are received from the processing tray 130, and is disposed at a position corresponding to the number of stacked sheets 2000 from the sheet surface detection sensor S205.

The sensor S203e is connected to the stack tray 20
It is a sensor that sets the lower limit position of 0.

The stack tray 200 and the sample tray 201 have a sheet presence / absence detection sensor 2 respectively.
06a and 206b are arranged.

[0086] Of these sensors, only the sheet surface detection sensors S204 and S205 are set to a light transmission type that detects the presence or absence of light by transmitting light from one side edge to the other side edge of the sheet P. Here, each sheet surface detection sensor S20 is used as the sheet surface detection method.
4, the initial state is a state in which the trays 200 and 201 are lifted from the lower part of S205 to a position covering the trays.
After the sheet is stacked, the sensor is lowered until the sensor optical axis appears, and then is repeatedly raised until the sensor optical axis is covered again.

<Detailed Description of Sheet P Flow> When the user wants to specify the non-sort mode on the operation unit (not shown) of the image forming apparatus main body, as shown in FIG.
The entrance roller pair 2, the transport roller 3, and the large transport roller 5 as a buffer roller rotate, and the main body 300 of the image forming apparatus 300 rotates.
The sheet P conveyed from is transported. Flapper 11
Rotates by the action of a solenoid (not shown) to the position shown in the figure, and conveys the sheet P to the non-sort path 21. When the sensor 33 detects the rear end of the sheet P, the roller 9
The sheet P rotates at a speed suitable for stacking, and discharges the sheet P to the sample tray 200.

Next, the operation when the user specifies the staple sort mode will be described.

As shown in FIG. 11, the entrance roller pair 2,
The conveying roller 3 and the large conveying roller 5 rotate, and convey the sheet P conveyed from the image forming apparatus main body 300.
The flappers 10 and 11 are stopped at the positions shown in the figure. The sheet P is discharged to the processing tray 130 by the first discharge roller pair 7 along the sort path 22. At this time, since the retreat tray 170 is at the protruding position, it is possible to prevent the leading end of the sheet P from being drooped and returning poorly before the sheet P is discharged by the discharge roller 7 and to improve the alignment of the sheets on the processing tray. I have.

The discharged sheet P starts to move to the rear end stopper 131 by its own weight. In addition, the paddle 160, which has stopped at the home position, is rotated counterclockwise by the driving of the motor M160, and Encourage movement. When the rear end of the sheet P surely comes into contact with the stopper 131 and stops, the rotation of the paddle 160 is also stopped, and the alignment member aligns the discharged sheet.

When all the sheets of the first copy are discharged onto the processing tray 130 and aligned, the swing guide 150 descends as shown in FIG. 12, and the upper bundle discharge roller 180b rides on the sheet bundle. The stapler 101 staples a sheet bundle.

Meanwhile, the image forming apparatus main body 300
As shown in FIG. 12, the sheet P ₁ is wound around the large conveying roller 5 by the rotation of the flapper 10, and stops when a predetermined distance has passed from the sensor 32. When you reach the next predetermined distance from the sheet P ₂ paper detection sensor 31, as shown in FIG. 13, the large conveying roller 5 is rotated, the first sheet towards the sheet P ₁ from the second sheet P ₂ is given As shown in FIG. 14, the sheets are superposed one on the other, wound around the large conveying roller 5, and stopped at a predetermined distance. On the other hand, the sheet bundle on the processing tray 130 is discharged onto the stack tray 200 by the discharge roller pair 180 as shown in FIGS.

However, at this time, the retracting tray 170 moves to the home position before the sheet bundle passes through the bundle discharge roller in order to drop the sheet bundle onto the stack tray 200. As shown in FIG. 15, when the third sheet P ₃ reaches the predetermined position, the large conveying roller 5 is rotated, superposed sheets P ₃ are shifted by a predetermined distance, the flapper 10 of the three pivots The sheet P is transported to the sort path 22.

As shown in FIG. 16, while the swing guide 150 is lowered, three sheets P are received by the bundle discharge rollers 180a and 180b, and as shown in FIG. When the pair passes through 7, the bundle discharge roller 180
a and 180b are reversed, and before the rear end abuts on the rear end stopper 131, the swinging guide rises as shown in FIG.
The roller 8 moves away from the sheet surface. The fourth and subsequent sheets P are discharged onto the processing tray through a sort path similarly to the operation of the first copy. After the third copy, the same operation as that of the second copy is performed, and the sheet bundle for the set number is stacked on the stack tray 200, and the process is completed.

[0095] In the above multi-sheet conveyance,
Each sheet P is offset in the transport direction, the sheet P ₂ is offset downstream with respect to the sheet P ₁ , and the sheet P
₃ is offset downstream with respect to the sheet P _2.

<Detailed Description of Sort Mode> The user sets a document on the RDF 400, specifies the sort mode on an operation unit (not shown), and turns on a start key (not shown).
I do. The entrance roller 2 and the transport roller 3 rotate as shown in FIG. 19 similarly to the staple sort mode, and stacks the sheet P on the processing tray 130. The aligning means 140 stacks a small number of sheets on the processing tray 130 while aligning the sheets P on the processing tray 130, and then the swing guide 150 descends as shown in FIG. Are conveyed in a bundle.

Next, the fed sheet P passes over the flapper 10, is wound around the large conveying roller 5 in the same manner as the operation described in the staple sort mode, and is discharged to the processing tray 130 after the bundle discharge. Is done. The number of the minority bundles to be discharged is desirably 20 or less by experiments. The number of sheets is set so as to satisfy the number of original sheets ≧ the number of sheets to be discharged ≦ 20 sheets. Therefore, when the number of sheets to be discharged in a bundle is set to five when a program is set, when the number of documents is four, the sheets are discharged in bundles of four sheets at a time. If the number of originals is 5 or more, for example, 14 sheets, they are divided into 5 + 5 + 4, aligned, and discharged in a bundle.

The second copy is aligned at the offset position, and a small number of sheets are discharged in bundles similarly to the first copy. When the second copy is completed, the front alignment member 141 and the rear alignment member 142
Returns to the position where the first copy is aligned, and aligns the third copy.

<Detailed Description of the Movement of the Stack Tray 200 and the Sample Tray 201> In FIGS. 8 and 9, each of the sample trays 201 and the stack tray 200 usually has its paper surface detection sensor position (normal loading position) before the operation starts. S2
04, waiting in S205.

In the above description, it is the stack tray 200 that normally stacks the copy or the printer output. The stack tray 200 receives the processed sheet by the stapler 101 or the like, or the bundle that is output in a small number of unbound sheets. Can,
A maximum of 2,000 sheets can be loaded, and this is detected by the sensor 203d.

At this time, if the output of the copy printer is still continued, the stack tray 200 is lowered from the sensor S203d by a position corresponding to 1000 sheets (the position of S203d '). Subsequently, the sample tray 201 is lowered to the sheet tray detection S205 for the sample tray, and the receiving of the sheet is started again. At this time, the sample tray 201
Can load up to a maximum of 1000 sheets.
3c detects it.

Next, after the job of 2000 sheets or less is completed, when the next job is started without interrupting the sheet on the stack tray 200 or when interrupting during the current job, the processing operation cannot be performed. However, using the sample tray 201, it is possible to load the paper from the non-sort discharge path 21.

Depending on the normal state, the non-sort discharge path 21
The mode for outputting to the sample tray 201 by using is a time when a sample output is performed without processing only one copy or a time when the sample tray output is set by function sorting.

Next, the essential parts of the sheet processing apparatus according to the present invention will be described with reference to FIGS. 22, 23 and 24.

First, in the case where the already stacked sheets on the processing tray 130 are curled, the discharge speed of the first discharge roller pair 7 is controlled to change because the frictional resistance to the discharged sheets is large. Here, the first discharge roller pair 7
Is different in the following points depending on the sheet curl state (upper curl, lower curl).

<In the case of a lower curl> If the already loaded sheet has a lower curl at the time of discharging the sheet, the frictional resistance at the time of discharging the sheet is small, but the discharged sheet passes over the already loaded sheet on the processing tray 130 at the rear end. The force that slides down on the stopper 131 or the loading wall becomes smaller when the loaded sheet has a lower curl, and thus may lose frictional resistance. In order to cope with this, it is necessary to control the discharge speed of the sheet of the first discharge roller pair 7 to be low, and to reduce the amount of the sheet that is ejected during the discharge.

<In the case of upper curl> If the already loaded sheet has an upper curl when the sheet is discharged, the frictional resistance increases. For this reason, the amount of the sheet jumped at the time of discharge may become insufficient, and the rear end of the sheet may lean on the rear end stopper 131. In order to cope with this, it is necessary to increase the discharge speed of the first discharge roller pair 7 to increase the amount of sheet jump at the time of discharge.

Hereinafter, the control of the discharge speed of the first discharge roller pair 7 will be described in more detail.

Here, the sensor 138 is a reflection-type sensor capable of measuring the distance S to the already loaded paper near the center of the processing tray (loading means, first loading means) 130 in the transport direction.
The sensor 139 is a reflective sensor capable of measuring the distance T to the already loaded paper near the rear end of the processing tray 130 in the transport direction. Here, the sensors 138 and 139 are connected to the processing tray 13.
The control unit 99 determines the curl state of the already loaded paper on the processing tray 130 from the distance S obtained from the sensor 138 and the distance T obtained from the sensor 139. , The discharge speed V1 of the first discharge roller pair (discharge means, first discharge means) 7 is controlled. The sensor 176 is a reflection type sensor that can measure the distance X to the loaded paper near the center of the stack tray 200 in the transport direction, and the sensor 177 is near the rear end of the stack tray 200 in the transport direction. This is a reflection type sensor capable of measuring the distance Y to the paper. Here, the sensors 176 and 177 are provided at positions parallel to the stack tray 200. Based on the distance X obtained from the sensor 176 and the distance Y obtained from the sensor 177, the controller 99 , The curl state of the already loaded paper on the second stacking means 200 is determined, and the discharge speed V2 of the bundle discharge roller pair (discharge means, second discharge means) 180 is controlled.

As shown in FIG. 22A, the processing tray 1
When the loaded paper (loaded sheet) on 30 is curled upward,
Based on the distance information S and T from the sensors 138 and 139, S is larger than T, so the control device 99 determines that the curl is upward,
The curl amount is obtained from the relative difference between S and T, the discharge speed V1 of the first discharge roller pair 7 is made to correspond to the speed table ST in FIG. 24, and the discharge speed V1 is controlled to be higher than usual. In this way, even if the loaded paper on the processing tray 130 has an upper curl, the paper can slide sufficiently along the sheet surface, and the loadability on the processing tray 130 can be improved. Similarly, when the loaded paper on the stack tray 200 has an upper curl, since the distance information X and Y from the sensors 176 and 177 indicates that X is larger than Y, the control device 99 determines that the curl is upper curl. The curl amount is obtained from the relative difference of Y, the discharge speed V2 of the bundle discharge roller pair 180 is made to correspond to the speed table in FIG. 24, and the discharge speed V2 is controlled to be higher than usual. Thus, the stack tray 200
Even if the upper loaded paper has an upper curl, the stack tray 2
The loadability at 00 can be improved.

As shown in FIG. 22B, the processing tray 1
When the loaded paper on the upper side 30 has a lower curl, the sensors 138, 1
Since S is smaller than T from the distance information S and T from 39, the control device 99 determines that the curl is lower, calculates the curl amount based on the relative difference between S and T, and outputs the discharge speed V1 of the first discharge roller pair 7. Correspond to the speed table of FIG.
1 is controlled to be slower than usual. In this way, even if the loaded paper on the processing tray 130 has a lower curl, the sheet can return without being disturbed by the convex portion at the central portion of the sheet, and the loadability on the processing tray 130 can be improved. . Similarly, when the loaded paper on the stack tray 200 has a lower curl, since the distance information X and Y from the sensors 176 and 177 indicates that X is smaller than Y, the control device 99 determines that the lower curl is present, and The curl amount is obtained from the relative difference of Y, the discharge speed V2 of the bundle discharge roller pair 180 is made to correspond to the speed table in FIG. 24, and the discharge speed V2 is controlled to be lower than usual. Thus, even if the already loaded paper on the stack tray 200 has a lower curl,
The loadability at 0 can be improved.

The sensors 138 and 139 constitute curl detecting means for detecting the curl state of the sheets stacked on the processing tray 130. The sensors 176 and 177 detect the curl state of the sheets stacked on the stack tray 200. A curl detecting means for detecting is formed.

Here, the speed table of FIG. 24 is adapted to the present embodiment, and does not limit the present invention.

As described above, the sensors 138, 13
9, the curl direction and the curl amount of the already loaded paper on the processing tray 130 are measured, and the discharge speed V1 of the first discharge roller pair 7 is controlled in accordance with the speed table.
The loadability on the processing tray 130 can be improved irrespective of the curl of the already loaded paper on the processing tray 130. Here, since the sensors 138 and 139 are configured to detect the curl state of the uppermost sheet of the already loaded paper on the processing tray 130, even if the curl of the already loaded paper on the processing tray 130 changes in the middle, Not affected. In addition, since the curl amount can be measured by using a distance measuring sensor for the sensors 138 and 139, the discharge speed V1 according to the curl amount can be measured.
Can be controlled. In addition, since the control device 99 has the speed table, it is possible to finely control the discharge speed V1 according to the curl.

The curl direction and the curl amount of the stacked paper on the stack tray 200 are measured by the sensors 176 and 177, and the discharge speed V2 of the bundle discharge roller pair 180 is measured.
Is controlled in accordance with the speed table, so that the stacking performance on the stack tray 200 can be improved irrespective of the curl of the already stacked paper on the stack tray 200. Here, the sensors 176 and 177 are connected to the stack tray 200.
Since the configuration is such that the state of the curl of the uppermost sheet of the already loaded paper is detected, even if the curl of the already loaded paper on the stack tray 200 changes in the middle, it is not affected.
In addition, since the curl amount can be measured by using a distance measuring sensor for the sensors 176 and 177, the discharge speed V2 can be controlled according to the curl amount. In addition, since the control device 99 has the speed table, it is possible to finely control the discharge speed V2 according to the curl amount.

[Second Embodiment] FIG. 25 shows a second embodiment.
1 is an overall cross-sectional view schematically illustrating a schematic configuration of an image forming apparatus system including a sheet stacking device according to the first embodiment. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

Reference numeral 701 denotes a sheet stacking apparatus as a sheet processing apparatus, and 702 denotes a stacking tray (stacking unit) for sheets discharged from the image output unit 300 of the image forming apparatus main body 1 '.
A main body discharge roller pair (discharge unit) that discharges the toner onto the main body 703 is driven by a motor M702. Reference numeral 704 shown in FIG. 26 denotes a lower curl detection sensor provided near the center of the stacking tray 703 in the transport direction, and is turned ON when a sensor flag (not shown) is pressed against the sheet. Reference numeral 705 denotes an upper curl detection sensor provided near the rear end of the stacking tray 703 in the transport direction, and is turned ON when a sensor flag (not shown) is pressed against the sheet. Reference numeral 799 denotes a control device, and the sensor 70
The curl direction of the loaded paper on the loading tray 703 is determined based on the ON signals 4 and 705, and the discharge speed V3 of the discharge roller pair 702 is controlled.

The sensors 704 and 705 constitute a curl detecting means for detecting the curl state of the sheet on the stacking tray 703.

First, when the loaded paper on the loading tray 703 has no curl, both the sensors 704 and 705 are turned ON. For this reason, the control device 799 determines that the loaded paper on the loading tray 703 is not curled, and
2 is set to V3a (600 in this embodiment).
mm / s).

As shown in FIG. 26A, the loading tray 7
03, the sensor 704 is set to O
N, but the sensor 705 does not turn on. For this reason, the control device 799 determines that the curl direction of the loaded paper on the loading tray 703 is upward curl, and sets the discharge speed V3 of the discharge roller pair 702 to V3b faster than V3a (700 mm / s in the present embodiment). To control. In this way, even if the already stacked paper on the stacking tray 703 has an upper curl, the stacking performance on the stacking tray 703 can be improved.

As shown in FIG. 26B, the loading tray 7
03 is curled downward, the sensor 705
N, but the sensor 704 does not turn on. For this reason, the control device 799 determines that the curl direction of the already loaded paper on the stacking tray 703 is downward curl, and sets the discharge speed V3 of the discharge roller pair 702 to V3c lower than V3a (500 mm / s in the present embodiment). To control. In this way, even if the loaded paper on the stacking tray 703 has a lower curl, the stacking performance on the stacking tray 703 can be improved.

As described above, the sensors 704, 70
5 detects the curl direction of the loaded paper on the loading tray 703, and controls the discharge speed V3 of the discharge roller pair 702, so that the loading tray 703 does not depend on the curl of the loaded paper on the loading tray 703. Can be improved.

Here, in order to make the sensors 704 and 705 simple, they are provided on the stacking tray 703 and are turned on when a sensor flag (not shown) is pressed by the sheet. If the curl direction and the curl amount of the uppermost sheet of the loaded paper on the tray are detected like the sensors 138 and 139 and the sensors 176 and 177, even if the curl of the loaded paper changes in the middle, the influence is obtained. I do not receive. In addition, since the curl amount can be measured by using a distance measuring sensor as the sensor, the discharge speed V3 can be controlled according to the curl amount. Further, since the control device 799 has a speed table as in the first embodiment, it is possible to finely control the discharge speed V3 according to the curl amount.

[Embodiment 3] FIG. 28 shows Embodiment 3 of the present invention.
1 is an overall cross-sectional view schematically illustrating a schematic configuration of an image forming apparatus according to the first embodiment. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

Reference numeral 303 denotes a stacking tray (stacking means) for stacking sheets discharged from the image forming apparatus main body 300 by the main body discharge roller pair (discharge means) 302. The main body discharge roller pair 302 is driven by a motor M302. Reference numeral 304 (FIG. 29) denotes a lower curl detection sensor provided near the center of the stacking tray 303 in the transport direction, which is turned on when a sensor flag (not shown) is pressed against the sheet.
Reference numeral 305 denotes an upper curl detection sensor provided near the rear end of the stacking tray 303 in the transport direction, and is turned ON when a sensor flag (not shown) is pressed by a sheet. A control device 310 determines the curl direction of the loaded paper on the loading tray 303 based on the ON signals of the sensors 304 and 305, and controls the discharge speed V4 of the main body discharge roller pair 302.

The sensors 304 and 305 constitute curl detecting means for detecting the curl state of the discharged sheet on the stacking tray 303.

First, when the loaded paper on the loading tray 303 has no curl, both the sensors 304 and 305 are turned ON. For this reason, the control device 310 determines that there is no curl of the already loaded paper on the loading tray 303, and controls the discharge speed V4 of the main body discharge roller pair 302 at V4a (600 mm / s in the present embodiment).

As shown in FIG. 29A, the loading tray 3
03, the sensor 304 is set to O
N, but the sensor 305 does not turn on. For this reason, the control device 310 determines that the curl direction of the already loaded paper on the stacking tray 303 is upward curl, and sets the discharge speed V4 of the discharge roller pair 302 to V4b faster than V4a (700 mm / s in the present embodiment). To control. In this way, even if the already loaded paper on the stacking tray 303 has an upper curl, the loadability on the stacking tray 303 can be improved.

As shown in FIG. 29B, the loading tray 3
03 is curled downward, the sensor 305
N, but the sensor 304 does not turn on. For this reason, the control device 310 determines that the curl direction of the loaded paper on the stacking tray 303 is the downward curl, and sets the discharge speed V4 of the discharge roller pair 302 to V4c lower than V4a (500 mm / s in the present embodiment). To control. In this way, even if the already loaded paper on the stacking tray 303 has a lower curl, the stacking ability on the stacking tray 303 can be improved.

As described above, the sensors 304 and 30
5 detects the curl direction of the loaded paper on the stacking tray 303 and controls the discharge speed V4 of the discharge roller pair 302, so that the curl of the loaded paper on the stacking tray 303 is independent of the curl of the loaded paper on the loading tray 303. Can be improved.

Here, in order to make the sensors 304 and 305 simple, they are provided on the stacking tray 303 and are turned on when a sensor flag (not shown) is pressed by the sheet. If the curl direction and the curl amount of the uppermost sheet of the loaded paper on the tray are detected like the sensors 138 and 139 and the sensors 176 and 177, even if the curl of the loaded paper changes in the middle, the influence is obtained. I do not receive. In addition, since the curl amount can be measured by using a distance measuring sensor as the sensor, the discharge speed V4 can be controlled according to the curl amount. Further, since the control device 310 has a speed table as in the first embodiment, it is possible to finely control the discharge speed V4 according to the curl amount.

[0132]

As described above, according to the present invention,
The curl detection unit detects the curl state of the sheet discharged by the discharge unit and stacked on the stacking unit, and the control unit controls the discharge speed of the discharge unit based on the curl information of the detection unit. As a result, the curled sheet can be satisfactorily stacked on the stacking means.

The curl detecting means detects the curl amount and the curl direction, which are the curl state of the sheet, and controls the discharge speed of the discharge means.
In addition, the sheets can be satisfactorily stacked on the stacking means in accordance with the curl amount.

Further, by controlling the discharge speed of the discharge means with a plurality of speed tables, a plurality of different speeds according to the curl amount of the sheet can be finely controlled, and the sheets can be satisfactorily stacked on the stacking means. .

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing the overall configuration of a sheet processing apparatus according to the present invention.

FIG. 2 is a side view of the staple unit.

FIG. 3 is a rear view of the stapler similarly viewed from the direction of the arrow in FIG. 2A.

FIG. 4 is a rear view of the stapler viewed from the direction of the arrow in FIG. 2B.

FIG. 5 is a vertical sectional side view of a swing guide and a processing tray.

FIG. 6 is a rear view of the processing tray and the alignment wall moving mechanism.

FIG. 7 is a plan view of the haunting tray.

FIG. 8 is a plan view of the stack tray moving mechanism.

FIG. 9 is also a sensor arrangement diagram around a stack tray.

FIG. 10 is an operation diagram of the sheet processing apparatus in the non-sort mode.

FIG. 11 is an operation diagram of the sheet processing apparatus in the staple sort mode.

FIG. 12 is an operation diagram of the sheet processing apparatus in the staple sort mode.

FIG. 13 is an operation diagram of the sheet processing apparatus in the staple sort mode.

FIG. 14 is an operation diagram of the sheet processing apparatus in the staple sort mode.

FIG. 15 is an operation diagram of the sheet processing apparatus in the staple sort mode.

FIG. 16 is an operation diagram of the sheet processing apparatus in the staple sort mode.

FIG. 17 is an operation diagram of the sheet processing apparatus in the staple sort mode.

FIG. 18 is an operation diagram of the sheet processing apparatus in the staple sort mode.

FIG. 19 is an operation diagram of the sheet processing apparatus in the sort mode.

FIG. 20 is an operation diagram of the sheet processing apparatus in the sort mode.

FIG. 21 is a vertical sectional front view of the image forming apparatus to which the sheet processing apparatus according to the invention is applied.

FIG. 22 is a schematic side view of a stack tray, a processing tray, and a retreat tray of the sheet processing apparatus according to the present invention.
(A) shows a state where upper curled paper is loaded on the processing tray and the stack tray, and (b) shows a state where lower curled paper is loaded on the processing tray and the stack tray.

FIG. 23 is a block diagram relating to control of the sheet processing apparatus according to the present invention.

FIG. 24 is a view showing a speed table of a discharge speed according to control of the sheet processing apparatus according to the present invention.

FIG. 25 is a vertical sectional front view of an image forming apparatus including the sheet processing apparatus according to the second embodiment of the present invention.

FIGS. 26A and 26B are schematic side views of a stacking tray of the sheet processing apparatus, wherein FIG. 26A is a state in which upper curl paper is stacked on the stacking tray, and FIG. Is loaded.

FIG. 27 is a block diagram related to control of the sheet processing apparatus.

FIG. 28 is a longitudinal sectional front view of the image forming apparatus according to Embodiment 3 of the present invention.

FIGS. 29A and 29B are schematic side views of the image forming apparatus. FIG. 29A is a state in which upper curl paper is stacked on a stacking tray, and FIG. 29B is a state in which lower curl paper is stacked on a stacking tray. State.

FIG. 30 is a block diagram related to control of the image forming apparatus.

[Explanation of symbols]

P Sheet, sheet bundle ST Speed table S205 Paper surface detection sensor (paper surface detection means) M170 Ejection tray motor (drive means) 1 Sheet processing device 1 'Image forming apparatus main body 4 Control device (control means) of sheet processing device 7 First discharge Roller pair 7 (first discharge unit, discharge unit) 99, 310, 799 Control unit (control unit) 130 Processing tray (stacking unit) 138, 139 Sensor (curl detection unit) 176, 177 Sensor (curl detection unit) 180 Bundle discharge roller pair (bundle discharge unit, discharge unit) 180a Lower bundle discharge roller 180b Upper bundle discharge roller 200 Stack tray (stacking unit) 300 Image output unit of main body of image forming apparatus 302 Main body discharge roller pair (main body discharge unit,
Discharge unit) 303 stacking tray (stacking unit) 304, 305 sensor (curl detection unit) 310 control unit (control unit) of the image forming apparatus main body 600 image forming unit (image forming unit) 701 sheet stacking unit 702 main body discharge roller pair ( Body discharge means,
Ejecting unit) 703 Stacking tray (stacking unit) 704, 705 Sensor (curl detecting unit)

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G03G 15/00 518 G03G 15/00 530 530 B41J 29/00 HF term (reference) 2C061 AP01 AP04 CK03 CK04 CK05 HH01 HJ04 HK11 HN02 HN15 HN18 2H072 AA01 AA09 AA16 AA18 AA24 AA25 AB09 AB12 AB13 CA01 CA02 CB01 FC17 FC19 FC20 GA02 GA08 3F048 AA02 AA05 AB01 BA11 BA23 BB05 DA09 EB29 EB40 3F049 DA12 EA10 CA02 LA03 LA01 LA01 LA04

Claims (8)

[Claims] A discharge unit configured to discharge the conveyed sheet; a stacking unit configured to stack the sheet discharged by the discharge unit; a curl detection unit configured to detect a curl state of the sheet stacked in the stacking unit; Based on the curl information of the sheet by the curl detecting means,
A sheet processing apparatus comprising: a control unit configured to control a discharge speed of the discharge unit. 2. The sheet processing apparatus according to claim 1, wherein the curl detecting unit is capable of detecting a curl direction and a curl amount of the sheet on the stacking unit. 3. The sheet processing apparatus according to claim 1, wherein the control unit is capable of controlling a discharge speed of the sheet discharge unit using a plurality of different speed tables. 4. A sheet discharging means for discharging a sheet, a processing tray for stacking sheets discharged by the sheet discharging means, a bundle discharging means for discharging a bundle of sheets stacked on the processing tray, and the bundle 4. A stack tray on which a stack of sheets discharged by a discharge unit is stacked, wherein the discharge unit is the sheet discharge unit, and the stacking unit is the processing tray. Sheet processing equipment. 5. A sheet discharging means for discharging sheets, a processing tray for stacking the sheets discharged by the sheet discharging means, a bundle discharging means for discharging a bundle of sheets stacked on the processing tray, and the bundle A stack tray for stacking the sheet bundle discharged by the discharging unit, wherein the discharging unit is the bundle discharging unit, and the stacking unit is the stack tray.
4. The sheet processing apparatus according to any one of claims 1 to 3. 6. A sheet discharging means for discharging sheets, a processing tray for stacking the sheets discharged by the sheet discharging means, a bundle discharging means for discharging a bundle of sheets stacked on the processing tray, and the bundle A stack tray for stacking the sheet bundle discharged by the discharging unit, wherein the discharging unit is the sheet discharging unit and the bundle discharging unit, and the stacking unit is the processing tray and the stack tray. 4. The sheet processing apparatus according to claim 1, wherein: 7. A sheet processing apparatus according to claim 1, wherein an image is formed on a fed sheet in accordance with image information, and the sheet on which an image is formed by the image forming means is transferred to the sheet. An image processing apparatus comprising: a main body discharging unit configured to discharge a sheet to a stacking unit of a processing apparatus; and a control unit configured to control a discharging speed of the main body discharging unit based on curl information obtained by the curl detecting unit of the sheet processing apparatus. Forming equipment. 8. An image forming means for forming an image on a fed sheet according to image information, a main body discharging means for discharging a sheet on which an image is formed by the image forming means, and a main body discharging means for discharging the sheet. Volume loading means for stacking the stacked sheets, curl detection means for detecting the curl state of the sheets on the full stacking means, and controlling the discharge speed of the main body discharge means based on the curl information of the sheet by the curl detection means. An image forming apparatus comprising: a control unit.